JPH0327843A - Method for uniformly and rapidly cooling continuous cast strip in width direction - Google Patents
Method for uniformly and rapidly cooling continuous cast strip in width directionInfo
- Publication number
- JPH0327843A JPH0327843A JP1159733A JP15973389A JPH0327843A JP H0327843 A JPH0327843 A JP H0327843A JP 1159733 A JP1159733 A JP 1159733A JP 15973389 A JP15973389 A JP 15973389A JP H0327843 A JPH0327843 A JP H0327843A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- slab
- cooling
- cast strip
- crown
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 16
- 239000010935 stainless steel Substances 0.000 claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims description 30
- 238000005266 casting Methods 0.000 claims description 10
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 101000649938 Mus musculus Vacuolar protein sorting-associated protein 28 homolog Proteins 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、鋳片と鋳型内壁面間に相対速度差のない、い
わゆる同期式連続鋳造機、特に垂直型双ロール式連続鋳
造機によって、鋳片厚さを製品厚さに近いサイズとして
ステンレス鋼薄板を製造する際に、鋳片段階から組織を
微細化して優れた表面性状を有するステンレス鋼薄板を
製造するために、キッシング・ポイントを通過した鋳片
を引き続き冷却ロールに接触させて急速冷却する方法に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a so-called synchronous continuous casting machine, particularly a vertical twin-roll continuous casting machine, in which there is no relative speed difference between the slab and the inner wall surface of the mold. When manufacturing thin stainless steel sheets with a slab thickness close to the product thickness, passing through a kissing point is necessary to refine the structure from the slab stage and produce stainless steel sheets with excellent surface properties. The present invention relates to a method for rapidly cooling a cast slab by subsequently bringing it into contact with a cooling roll.
従来、連続鋳造法を用いてステンレス鋼薄板を製造する
には、鋳型を鋳造方向に振動させながら厚１００ｍｍ以
上の鋳片に鋳造し、得られた鋳片の表面手入れを行い、
加熱炉において１０００℃以上に加熱した後、粗圧延機
および仕上圧延機列からなるホットストリップミルによ
って熱間圧延を施し、厚さ数ｍ［Ｉ１のホットストリッ
プとしていた。Conventionally, in order to manufacture stainless steel thin plates using the continuous casting method, a slab of 100 mm or more in thickness is cast while the mold is vibrated in the casting direction, and the surface of the resulting slab is treated.
After heating to 1000° C. or higher in a heating furnace, hot rolling was performed in a hot strip mill consisting of a rough rolling mill and a finishing rolling mill row to form a hot strip with a thickness of several meters [I1].
こうして得られたホットストリップを冷間圧延するに際
しては、最終製品に要求される形状（平坦さ〉、材質、
表面性状を確保するために、強い熱間加工を受けたホッ
トストリップを軟化させるための熱延板焼鈍を行うとと
もに、表面のスケール等を酸洗工程の後に研削によって
除去していた。When cold rolling the hot strip obtained in this way, the shape required for the final product (flatness, material,
In order to secure the surface quality, hot-rolled sheets were annealed to soften the hot strips that had undergone intense hot working, and scales and the like on the surface were removed by grinding after the pickling process.
この従来のプロセスにおいては、長大な熱間圧延設備で
、材料の加熱および加工のために多大のエネルギを必要
とし、生産性の面でも優れた製造プロセスとは言い難か
った。また、最終製品は、１００ｍｍ以上の厚さの鋳片
から多くの加工が加えられて製造されるために集合組織
が発達し、製品に、ユーザーにおいてプレス加工等を加
えるときはその異方性を考慮することが必要となる等使
用上の制約も多かった。This conventional process requires a large amount of energy to heat and process the material in a long hot rolling facility, and cannot be said to be an excellent manufacturing process in terms of productivity. In addition, because the final product is manufactured from a cast slab with a thickness of 100 mm or more and subjected to many processes, the texture develops, and when the user applies press processing etc. to the product, its anisotropy is There were also many restrictions on use that needed to be taken into account.
処で、１００帥以上の厚さの鋳片をホットストリップに
圧延するために、長大な熱間圧延設備と多大なエネルギ
、圧延動力を必要とするという問題を解決すべく、最近
、連続鋳造の過程でホットストリップと同等か或はそれ
に近い厚さの鋳片（薄帯〉を得るプロセスの研究が進め
られている。たとえば、「鉄と鋼Ｊ’８５． Ａ１９７
〜’８５， Ａ２５６において特集された論文に、ホッ
トス｝ ＩＪップを連続鋳造によって直接的に得るプロ
セスが開示されている。このような連続鋳造プロセスに
あっては、得ようとする鋳片（ストリップ〉の厚さが１
〜１０ｍｍの水準であるときは双ロール方式が検討され
ている。In order to solve the problem of requiring a long hot rolling facility and a large amount of energy and rolling power in order to roll slabs with a thickness of 100 mm or more into hot strips, continuous casting has recently been developed. Research is underway on a process to obtain slabs (thin strips) with a thickness equal to or close to that of hot strip.For example, "Tetsu to Hagane J'85. A197
A featured article in ~'85, A256 discloses a process for obtaining hot springs directly by continuous casting. In such a continuous casting process, the thickness of the slab to be obtained is 1
A twin roll system is being considered for the level of ~10 mm.
しかしながら、これらの連続鋳造プロセスにおいては鋳
造段階にも未だ問題があるとされ、製品の材質や表面性
状に関して問題が解決したという段階には至っていない
。However, in these continuous casting processes, there are still problems at the casting stage, and the problems regarding the material and surface quality of the product have not yet been resolved.
新しいプロセスとして開発が進められている、ホットス
トリップと同等か或はそれに近い厚さの鋳片（薄帯）を
連続鋳造によって得ることを前提とするプロセスにおい
ては、鋳造から製品までの工程が簡略化されるために、
ステンレス鋼製品の表面特性が、鋳片性状に敏感に影響
されることになる。即ち、優れた表面性状を有する製品
を得るためには、優れた鋳片を得る必要がある。The process from casting to product is simplified in a process that is being developed as a new process and is based on the premise of obtaining slabs (thin strips) with the same or similar thickness as hot strip through continuous casting. In order to become
The surface properties of stainless steel products are sensitively affected by the properties of the slab. That is, in order to obtain a product with excellent surface properties, it is necessary to obtain an excellent slab.
特に、ステンレス鋼薄板製品に特有の光沢むらやローピ
ング現象と呼ばれる表面欠陥は、製品の商品価値を著し
く損うため、確実に防止される必要がある。In particular, surface defects called uneven gloss and roping, which are unique to stainless steel sheet products, must be reliably prevented since they significantly reduce the commercial value of the product.
ローピング等の表面欠陥の発生は、鋳片の凝固組織の粗
大化と密接な関係がある。特に、垂直型双ロール式連゛
続鋳造機の場合には、一対の冷却口−ル間のキッシング
ポイントから出現した鋳片は冷却ロールから離れてしま
うため、冷却ロールとの金属接触による急速冷却が行な
われず空冷状態となる。その結果、結晶粒成長の著しい
高温域に鋳片が滞溜する時間が長くなるため組織が粗大
化し、最終的な薄板製品に表面欠陥が発生し易い。The occurrence of surface defects such as roping is closely related to the coarsening of the solidified structure of the slab. In particular, in the case of a vertical twin-roll continuous casting machine, the slab that emerges from the kissing point between a pair of cooling holes separates from the cooling roll, so it is rapidly cooled by metal contact with the cooling roll. is not performed, resulting in an air-cooled state. As a result, the time that the slab remains in the high-temperature region where crystal grain growth is significant increases, resulting in a coarser structure and a tendency for surface defects to occur in the final sheet product.
したがって、鋳造組織の粗大化を防止するために、キッ
シングポイント通過後の鋳片を急速冷却することが極め
て重要である。Therefore, in order to prevent coarsening of the cast structure, it is extremely important to rapidly cool the slab after passing through the kissing point.
鋳片を急冷するには、キッシングポイント以降も引き続
き、鋳片を冷却ロールの冷却面（＝外周面〉と金属接触
させることが最も効果的である。In order to rapidly cool the slab, it is most effective to continue to bring the slab into metal contact with the cooling surface (=outer surface) of the cooling roll after the kissing point.
そのための方法として、たとえば、（１）鋳片に張力を
与えることにより冷却ロール表面に引き続き密着させる
方法（特公昭６３−１９２５８）や、（２〉主ロールの
周方向に沿って複数の水冷補助ロールを設け、鋳片を主
ロールと補助ロールの間を通して冷却させる方法（特開
昭６３−６８２４８）が知られている。これらの方法は
、鋳片の幅が比較的狭いリボン状の鋳片等では効果が期
待できる。しかし、広幅のステンレス鋼板を製造する場
合等のように鋳片幅を広くする必要がある場合には次の
ような基本的な問題がある。Examples of methods for this purpose include (1) applying tension to the slab so that it remains in close contact with the surface of the cooling roll (Japanese Patent Publication No. 63-19258), and (2) applying multiple water cooling aids along the circumferential direction of the main roll. A method is known (Japanese Patent Laid-Open No. 63-68248) in which rolls are provided and the slab is cooled by passing it between a main roll and an auxiliary roll. However, when it is necessary to widen the slab width, such as when manufacturing wide stainless steel sheets, there are the following basic problems.
冷却ロールはそれ自体の内部に冷却水の流路を設けてあ
るため、圧延ロール等に比べてかなり剛性が低く熱的な
変形も大きい。ロール胴長の両端部はロール全体の剛性
を確保する支柱部分として高い剛性が確保されているが
、ロール胴長の中間部分は剛性が低くなる構造とならざ
るを得ない。Since the cooling roll is provided with a cooling water flow path inside itself, its rigidity is considerably lower than that of a rolling roll or the like, and thermal deformation is large. Although both end portions of the roll body length serve as support portions that ensure the rigidity of the entire roll, high rigidity is ensured, but the middle portion of the roll body length must have a structure in which the rigidity is low.
そのため、ロールの昇温時には胴長中間部の径が相対的
に拡大し、降温時には逆に収縮し、ロール温度によって
ロールのクラウンがかなり変化する。Therefore, when the temperature of the roll increases, the diameter of the intermediate portion of the body length increases, and when the temperature decreases, it contracts, and the crown of the roll changes considerably depending on the temperature of the roll.
したがって、冷却ロールクラウンは、キッシングポイン
ト以降の部分では鋳片クラウンよりも急な曲率となるた
め、そのまま両者を接触させても鋳片の両側縁部が冷却
ロール胴長の両端部に接触するのみであり、鋳片幅方向
全体の急冷が行なわれない。Therefore, the cooling roll crown has a steeper curvature than the slab crown in the area after the kissing point, so even if they are brought into contact as is, the edges on both sides of the slab will only come into contact with both ends of the cooling roll body length. Therefore, rapid cooling of the entire slab in the width direction is not performed.
前記公報（１）および（２）の方法においては上記の問
題点について何ら考慮されておらず、ステンレス鋼薄板
の表面欠陥を防止するための鋳片急冷方法としては全く
不十分である。前記公報〈１〉の方法で付与する張力を
大きくすることによって鋳片の幅方向中間部をも冷却ロ
ールに接触させることも考えられるが、その場合キッシ
ングポイントで凝固直後の鋳片に過大な張力が負荷され
ることになり、鋳片が破断する等の危険が大きいため現
実の方策としては採用できない。The methods of Publications (1) and (2) do not take any of the above-mentioned problems into account, and are completely inadequate as a method for rapidly cooling slabs for preventing surface defects in stainless steel thin plates. It is also possible to bring the middle part of the slab in the width direction into contact with the cooling roll by increasing the tension applied using the method of Publication <1>, but in that case, excessive tension may be applied to the slab immediately after solidification at the kissing point. This cannot be adopted as a practical measure, as there is a great risk that the slab will break.
本発明は、垂直型双ロール式連続鋳造機によってステン
レス鋼の薄肉鋳片を鋳造する際に、鋳片凝固組織の粗大
化を防止するために、凝固後から結晶粒成長の著しい温
度範囲を引き続き鋳片全幅を均一に急速冷却する方法を
提供することを目的とする。In order to prevent coarsening of the solidified structure of the slab when casting thin stainless steel slabs using a vertical twin-roll continuous casting machine, the present invention continuously controls the temperature range in which crystal grains grow rapidly after solidification. The purpose of the present invention is to provide a method for uniformly and rapidly cooling the entire width of a slab.
上記の目的は、本発明によれば、一対の冷却ロールの外
周面が鋳片と同期して移動する鋳型壁を構或する垂直型
双ロール式連続鋳造機によってステンレス鋼の薄肉鋳片
を鋳造する際に、キッシング・ポイントから出現した鋳
片を上記一対のうちの一方の冷却ロールの外周面に接触
させて急速冷却する方法において、キッシング・ポイン
トよりも下流側で、冷却ロールクラウンと鋳片クラウン
とに基づいて予め設定した押付け面形状を有する押付け
ロールで、鋳片を上記一方の，冷却ロールの外周面に押
し付けることによって、凝固後から結晶粒成長の著しい
温度範囲を引き続き鋳片全幅を均一に急速冷却すること
を特徴とするステンレス鋼連続鋳造薄肉鋳片の幅方向均
一急速冷却方法によって達或される。According to the present invention, thin-walled slabs of stainless steel are cast by a vertical twin-roll continuous casting machine in which the outer peripheral surface of a pair of cooling rolls constitutes a mold wall that moves in synchronization with the slab. In this method, the slab emerging from the kissing point is brought into contact with the outer peripheral surface of one of the pair of cooling rolls to rapidly cool the slab. By pressing the slab against the outer circumferential surface of one of the cooling rolls using a pressing roll with a pressing surface shape preset based on the crown, the entire width of the slab is continuously maintained in the temperature range where crystal grains grow rapidly after solidification. This is achieved by a method of uniformly rapid cooling in the width direction of continuously cast thin stainless steel slabs, which is characterized by uniformly rapid cooling.
垂直型双ロール式連続鋳造法においては、第４図に示し
たように、冷却ロール１および２とサイド堰（図示せず
）で画或された鋳型内に注入された溶鋼３が、冷却ロー
ル１．２による抜熱によりキッシングボイン｝ａでほぼ
肉厚中心部まで凝固して、鋳片４として出現する。その
際、第３図に第４図のＡ−Ａ断面を示したように、キッ
シングポイントａでの冷却ロールクラウンＣＩＩＡによ
って、必要な鋳片クラウンＣＡ（すなわち鋳片の幅方向
断面プロフィル）が決定される。そのため、冷却ロール
クラウンは、キッシングポイントａの温度で所定鋳片ク
ラウンＣＡを与えるＣＩＩＡとなるように設計されてお
り、キッシングポイント温度より低温においては冷却ロ
ール胴長中間部分の相対的熱収縮によってＣＲＡ （＝
ＣＡ ）よりも急な曲率のクラウンＣＩＯになる。In the vertical twin roll continuous casting method, as shown in Fig. 4, molten steel 3 injected into a mold defined by cooling rolls 1 and 2 and a side weir (not shown) passes through the cooling rolls. As a result of the heat removal in step 1.2, the slab solidifies almost to the center of the wall thickness at the kissing boiling point }a, and emerges as a slab 4. At that time, as shown in the A-A cross section of Fig. 4 in Fig. 3, the necessary slab crown CA (i.e., the cross-sectional profile in the width direction of the slab) is determined by the cooling roll crown CIIA at the kissing point a. be done. Therefore, the cooling roll crown is designed to be CIIA that gives a predetermined slab crown CA at the temperature of kissing point a, and at a temperature lower than the kissing point temperature, CRA is (=
The crown CIO has a steeper curvature than CA).
本発明の方法においては、第２図に示したように、キッ
シングポイントａから出現した鋳片４を、キッシングボ
イン｝ａよりも下流側の位置ｂで、冷却ロールクラウン
と鋳片ロールクラウンとに基づいて予め設定した押付け
面形状を有する押付けロール５で片方の冷却ロール１に
押し付ける（第１図（ａ））。このとき冷却ロール１は
第３図に示したＣＩＩＯに収縮している。In the method of the present invention, as shown in FIG. 2, the slab 4 that has emerged from the kissing point a is placed between the cooling roll crown and the slab roll crown at a position b downstream of the kissing point a. Based on this, a pressing roll 5 having a pressing surface shape set in advance is pressed against one of the cooling rolls 1 (FIG. 1(a)). At this time, the cooling roll 1 has shrunk to CIIO shown in FIG.
押付け面形状とは、鋳片４を冷却ロールｌに押し付けて
いるときに鋳片と接触している部分の押付けロール面形
状である。そのために、適当ブ；クラウンを有する押付
けロール５を用いてもよく、あるいは押付けロールに適
当なペンディングを付与してもよい（第１図（ｂ））。The pressing surface shape is the shape of the pressing roll surface of the portion that is in contact with the slab when the slab 4 is pressed against the cooling roll l. For this purpose, a pressure roll 5 with a suitable crown may be used or a suitable tension may be provided on the pressure roll (FIG. 1(b)).
押付けロールのクラウン量および／またはペンディング
量は、冷却ロールの寸法（クラウン、幅等）、押付けロ
ールの径、鋳片クラウン等から実験によって適当に設定
する。The amount of crown and/or the amount of pending of the pressing roll is appropriately set by experiment based on the dimensions (crown, width, etc.) of the cooling roll, the diameter of the pressing roll, the crown of the slab, etc.
このように、本発明の方法では、冷却ロールクラウンと
鋳片クラウンとに基づいて設定した押付け面形状の押付
けロールで鋳片を冷却ロールに押付けることによって、
鋳片全幅を冷却ロールと金属接触させるので、鋳片の幅
方向に関して均一に急速冷却を行なうことができる。As described above, in the method of the present invention, by pressing the slab against the cooling roll with the pressing roll whose pressing surface shape is set based on the cooling roll crown and the slab crown,
Since the entire width of the slab is brought into metal contact with the cooling roll, rapid cooling can be performed uniformly in the width direction of the slab.
以下に、実施例によって本発明を更に詳細に説明する。The present invention will be explained in more detail below by way of Examples.
実施例ｌ
第２図に部分的に示した垂直型双ロール式連続鋳造機に
よって、第１図（ａ）に示したように本発明にしたがっ
て適当なクラウンの押付けロール５を用いてＪＩＳ Ｓ
ｔｌＳ ３０４鋼の薄肉鋳片４ （厚さ２帥、幅８００
ｍ）を鋳造した。Embodiment 1 By means of a vertical twin-roll continuous casting machine partially shown in FIG. 2, a JIS S.
Thin slab of tlS 304 steel 4 (thickness 2 cm, width 800 mm
m) was cast.
用いた冷却ロールｌは、直径ｌ２００ｍ、幅８００Ｉｌ
！ｌＩｌであり、クラウン量１５０Ｉ！ｍであった。The cooling roll used had a diameter of 200 m and a width of 800 Il.
! It is lIl and the crown amount is 150I! It was m.
押付けロール５は直径４０ｍｍ、幅８００ｍｍであり、
クラウン量５０−であった。The pressing roll 5 has a diameter of 40 mm and a width of 800 mm,
The crown amount was 50-.
鋳造温度１５００℃で鋳造を行なった。この場合、キッ
シングポイントでの冷却ロール温度は３５０℃であり、
冷却ロールクラウン量〈ロール胴長中央部）はキッシン
グポイントから２５０帥下流の押付け位置（点ｂ１第２
図）との間でＩＯＯＪ−だけ内側に移動することに基づ
いて、上記押付けロールのクラウン量を設定した。Casting was carried out at a casting temperature of 1500°C. In this case, the cooling roll temperature at the kissing point is 350°C,
The cooling roll crown amount (center of roll body length) is at the pressing position 250 degrees downstream from the kissing point (point b1 second
The crown amount of the pressing roll was set based on the movement inward by IOOJ- between the pressing roll and the pressing roll.
実施例２
第１図（ｂ）に示したように、本発明にしたがって押付
けロール（クラウンなし）５にペンディングを付与して
鋳造を行なった。ペンディング量は、押付けロール中央
部で５０ｎであった。押付ロール以外の条件は実施例ｌ
と同様であった。Example 2 As shown in FIG. 1(b), according to the present invention, a pressing roll (without a crown) 5 was given pending and casting was performed. The pending amount was 50n at the center of the pressing roll. Conditions other than the pressing roll are as in Example 1.
It was the same.
比較例１
実施例２のクラウンなしの押付けロール５を用い、ペン
ディングを付与せずに他の条件は実施例２と同様にして
鋳造を行なった。Comparative Example 1 Using the pressure roll 5 without a crown of Example 2, casting was carried out under the same conditions as Example 2 without applying pending.
比較例２
第４図に部分的に示した垂直型双ロール式連続鋳造機に
よって、押付けロールを用いずに鋳造を行なった。Comparative Example 2 Casting was carried out using a vertical twin-roll continuous casting machine partially shown in FIG. 4 without using a pressing roll.
実施例１．２および比較例１．２で得られた鋳片につい
て、鋳片幅方向で平均γ粒径の分布を調べた。結果を第
ｌ表に示す。Regarding the slabs obtained in Example 1.2 and Comparative Example 1.2, the distribution of average γ grain size in the slab width direction was investigated. The results are shown in Table I.
第 １ 表
金属接触による急冷が全くなされなかったため、鋳片幅
全体で粗大化している。Table 1: Because no rapid cooling was performed through metal contact, the entire width of the slab became coarse.
以上の例では、Ｃｒ−Ｎｉ系ステンレス鋼であるＳＵＳ
３０４鋼について本発明の急冷効果を説明したが、本
発明はＣｒ−Ｎｉ系に限らずステンレス鋼一般に適用で
きる。In the above example, SUS, which is Cr-Ni stainless steel,
Although the quenching effect of the present invention has been described with respect to 304 steel, the present invention is applicable not only to Cr-Ni steel but also to stainless steel in general.
＊（注）：平均ｒ粒径・・・光学顕微鏡（倍率ｌ００）
で同一視野′中の結晶粒個数を計数し、結晶粒を球とし
て換算した直径。*(Note): Average r particle size...optical microscope (magnification 100)
The number of crystal grains in the same field of view is counted, and the diameter of the crystal grains is calculated as a sphere.
結果から明らかなように、本発明の方法によれば鋳片全
幅について組織の粗大化が防止されており、冷延でのロ
ーピング発生を防止できる目安である平均Ｔ粒径１００
Ｊ−以下を十分満たしている。As is clear from the results, the method of the present invention prevents coarsening of the structure over the entire width of the slab, and the average T grain size of 100, which is a guideline for preventing the occurrence of roping during cold rolling.
J- or below is fully satisfied.
比較例ｌでは、鋳片側縁部のみは冷却ロールとの金属接
触による急冷によって粗大化が防止されているが、鋳片
幅の中間部分すなわち鋳片の実質的な主要部分では粗大
化している。比較例２では、〔発明の効果〕
以上説明したように、本発明によれば、垂直型双ロール
式連続鋳造機によってステンレス鋼の薄肉鋳片を鋳造す
る際に、キッシングポイントでの凝固後から結晶戊長の
著しい温度範囲を引き続き鋳片全幅を均一に急速冷却す
ることよって、鋳片凝固組織の粗大化を防止することが
でき、最終冷延後の薄板製品のローピング等の表面欠陥
の発生を十分に防止することができる。In Comparative Example 1, only the edge of one side of the cast is prevented from becoming coarse due to rapid cooling through metal contact with the cooling roll, but the middle part of the width of the slab, that is, the substantial main part of the slab, is coarsened. In Comparative Example 2, [Effects of the Invention] As explained above, according to the present invention, when a thin stainless steel slab is cast by a vertical twin-roll continuous casting machine, after solidification at the kissing point, By uniformly and rapidly cooling the entire width of the slab in the temperature range where the crystal lengthening is significant, it is possible to prevent the coarsening of the solidified slab structure and prevent the occurrence of surface defects such as roping in thin sheet products after final cold rolling. can be sufficiently prevented.
第ｌ図（ａ）および（ｂ）は、本発明にしたがってそれ
ぞれ（ａ）クラウンのある押付けロールを用い、および
（ｂ）クラウンのない押付けロールにペンディングを付
与して鋳片を冷却ロールに押し付けている状態を示す断
面図、
第２図は、垂直型双ロール式連続鋳造機で押付けロール
を用いている状態を示す断面図、第３図は、冷却ロール
クラウンと鋳片クラウンの関係を示す第４図Ａ−Ａでの
断面図、および第４図は、押付けロールを用いない従来
の垂直型双ロール式連続鋳造法を示す断面図である。
１．２・・・冷却ロール、 ３・・・溶瀾、４・・・鋳
片、 ５・・・押付けロール。FIGS. 1(a) and (b) illustrate pressing a slab against a cooling roll in accordance with the present invention, respectively (a) using a crowned pressing roll and (b) applying a pendant to an uncrowned pressing roll. Figure 2 is a cross-sectional view showing a vertical twin-roll continuous casting machine in which a pressing roll is used; Figure 3 is a diagram showing the relationship between the cooling roll crown and the slab crown. FIG. 4 is a cross-sectional view taken along line A-A and FIG. 4 is a cross-sectional view showing a conventional vertical twin-roll continuous casting method that does not use a pressing roll. 1.2... Cooling roll, 3... Molten slag, 4... Slab, 5... Pressing roll.
Claims (1)
る鋳型壁を構成する垂直型双ロール式連続鋳造機によっ
てステンレス鋼の薄肉鋳片を鋳造する際に、キッシング
・ポイントから出現した鋳片を上記一対のうちの一方の
冷却ロールの外周面に接触させて急速冷却する方法にお
いて、キッシング・ポイントよりも下流側で、冷却ロー
ルクラウンと鋳片クラウンとに基づいて予め設定した押
付け面形状を有する押付けロールで、鋳片を上記一方の
冷却ロールの外周面に押し付けることによって、凝固後
から結晶粒成長の著しい温度範囲を引き続き鋳片全幅を
均一に急速冷却することを特徴とするステンレス鋼連続
鋳造薄肉鋳片の幅方向均一急速冷却方法。1. When casting thin stainless steel slabs using a vertical twin-roll continuous casting machine, where the outer peripheral surface of a pair of cooling rolls forms the mold wall that moves in synchronization with the slab, it appears from the kissing point. In the method of rapidly cooling the slab by bringing it into contact with the outer peripheral surface of one of the pair of cooling rolls, a pressing surface that is preset on the downstream side of the kissing point based on the cooling roll crown and the slab crown. A stainless steel product characterized in that by pressing the slab against the outer circumferential surface of one of the cooling rolls using a pressing roll having a shape, the entire width of the slab is uniformly and rapidly cooled after solidification in a temperature range where crystal grain growth is significant. A method for uniformly rapid cooling in the width direction of continuously cast thin-walled steel slabs.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1159733A JPH0327843A (en) | 1989-06-23 | 1989-06-23 | Method for uniformly and rapidly cooling continuous cast strip in width direction |
| US07/536,432 US5052471A (en) | 1989-06-23 | 1990-06-08 | Method of rapidly and uniformly widthwise cooling cast stainless steel strip in continuous casting |
| EP90111663A EP0404106B1 (en) | 1989-06-23 | 1990-06-20 | Apparatus and method of rapidly and uniformly widthwise cooling cast stainless steel strip in continuous casting |
| DE69022635T DE69022635T2 (en) | 1989-06-23 | 1990-06-20 | Device and method for rapid and uniform cooling of continuously cast, stainless steel strip in the transverse direction. |
| ES90111663T ES2077607T3 (en) | 1989-06-23 | 1990-06-20 | APPARATUS AND METHOD FOR QUICK AND UNIFORM TRANSVERSE COOLING OF A STAINLESS STEEL BELT MOLDED BY CONTINUOUS CASTING. |
| KR1019900009355A KR930011960B1 (en) | 1989-06-23 | 1990-06-23 | Method of rapidly and uniformly widthwise cooling stainless steel strip in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1159733A JPH0327843A (en) | 1989-06-23 | 1989-06-23 | Method for uniformly and rapidly cooling continuous cast strip in width direction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0327843A true JPH0327843A (en) | 1991-02-06 |
| JPH0569625B2 JPH0569625B2 (en) | 1993-10-01 |
Family
ID=15700084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1159733A Granted JPH0327843A (en) | 1989-06-23 | 1989-06-23 | Method for uniformly and rapidly cooling continuous cast strip in width direction |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5052471A (en) |
| EP (1) | EP0404106B1 (en) |
| JP (1) | JPH0327843A (en) |
| KR (1) | KR930011960B1 (en) |
| DE (1) | DE69022635T2 (en) |
| ES (1) | ES2077607T3 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279595A (en) * | 1993-07-06 | 1995-01-11 | British Steel Plc | Continuous casting using rollers having varying radii across their width |
| US5477911A (en) * | 1994-03-24 | 1995-12-26 | Danieli United, Inc. | Twin roller caster |
| AT402267B (en) * | 1995-04-25 | 1997-03-25 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING A STRAND IN THE FORM OF A METAL STRIP, AND DEVICE FOR CARRYING OUT THE METHOD |
| MY113516A (en) * | 1995-09-05 | 2002-03-30 | Nippon Steel Corp | Thin cast strip formed of molten steel, process for its production, and cooling drum for thin cast strip continuous casting apparatus |
| ES2165302B1 (en) * | 2000-02-02 | 2003-06-01 | Aceralia Perfiles Madrid S L | PERFECTED CONTINUOUS COLADA SYSTEM. |
| AU2008100847A4 (en) * | 2007-10-12 | 2008-10-09 | Bluescope Steel Limited | Method of forming textured casting rolls with diamond engraving |
| US8607847B2 (en) * | 2008-08-05 | 2013-12-17 | Nucor Corporation | Method for casting metal strip with dynamic crown control |
| CN111363968B (en) * | 2020-04-03 | 2021-02-26 | 阳春新钢铁有限责任公司 | HPB300 steel and production method for improving surface scab of HPB300 steel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6319258A (en) * | 1986-07-14 | 1988-01-27 | Canon Inc | Recording apparatus |
| JPS6368248A (en) * | 1986-09-09 | 1988-03-28 | Daido Steel Co Ltd | Roll type continuous casting method |
| JP2542015B2 (en) * | 1987-11-20 | 1996-10-09 | 新日本製鐵株式会社 | Continuous casting equipment for metal ribbon |
-
1989
- 1989-06-23 JP JP1159733A patent/JPH0327843A/en active Granted
-
1990
- 1990-06-08 US US07/536,432 patent/US5052471A/en not_active Expired - Lifetime
- 1990-06-20 ES ES90111663T patent/ES2077607T3/en not_active Expired - Lifetime
- 1990-06-20 DE DE69022635T patent/DE69022635T2/en not_active Expired - Fee Related
- 1990-06-20 EP EP90111663A patent/EP0404106B1/en not_active Expired - Lifetime
- 1990-06-23 KR KR1019900009355A patent/KR930011960B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| US5052471A (en) | 1991-10-01 |
| EP0404106A1 (en) | 1990-12-27 |
| ES2077607T3 (en) | 1995-12-01 |
| KR910000271A (en) | 1991-01-29 |
| EP0404106B1 (en) | 1995-09-27 |
| KR930011960B1 (en) | 1993-12-23 |
| DE69022635D1 (en) | 1995-11-02 |
| JPH0569625B2 (en) | 1993-10-01 |
| DE69022635T2 (en) | 1996-03-14 |
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